Early early-Cretaceous post-collisional tectonic setting of the southern segment of the Great Xing'an Range: Evidence from the Lanjiayingzi gabbro-diorite in Linxi area
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摘要:
对大兴安岭南段林西县以北兰家营子辉长闪长岩开展了系统的岩石学、锆石年代学和地球化学分析，以揭示该岩体的成因，并探讨大兴安岭南段早白垩世大地构造背景。锆石U-Pb定年结果表明，该岩体的形成时代为145.6±0.6 Ma，为早白垩世早期侵入体。地球化学分析结果表明，该岩体SiO2含量为53.38%~54.45%，K2O含量为1.34%~1.43%，Na2O含量为3.85%~4.05%，铝饱和指数A/CNK值介于0.8~0.9之间，属于钙碱性偏铝质岩浆岩。岩石的MgO和TFe2O3含量分别为5.44%~5.73%和7.53%~8.33%，相应的Mg#值介于36.96~38.24之间，结合斜长石的环带和辉石的包橄结构，认为岩石是幔源原始岩浆经历分离结晶作用的产物。岩石相对富集Rb、Ba等大离子亲石元素，亏损Nb、Ta等高场强元素，锆石εHf（t）介于5.4~9.0之间，指示岩浆起源于亏损的受俯冲流体交代过的岩石圈地幔。兰家营子辉长闪长岩与林西地区同时代A型花岗岩构成双峰式岩浆岩组合，指示它们是伸展环境的产物。综合区域地质资料，认为大兴安岭南段早白垩世早期岩浆岩的形成与蒙古-鄂霍茨克洋闭合引起的碰撞后伸展背景有关。
Abstract:Based on the systematic petrology, zircon chronology and geochemistry analysis of the Lanjiayingzi gabiodiorite pluton in the north of Linxi County in southern Great Khingan Range, genesis of the pluton and the Early Cretaceous tectonic setting are discussed.Zircon U-Pb dating reveals that the pluton was formed in Early Cretaceous (145.6±0.6 Ma).Geochemistry of the pluton is characterized by 53.38%~54.45% of SiO2 contents, 1.34%~1.43% of K2O contents and 3.85%~4.05 % of Na2O contents, with 0.8~0.9 of A/CNK, which indicates that the pluton belongs to a calc-alkaline metaluminous magmatic rock.Its MgO and TFe2O3 contents vary from 5.44%~5.73% and 7.53%~8.33% respectively, with 36.96 to 38.24 of Mg# values.Combined with the girdle of plagioclase and the poikilitic texture of olivine in clinopyroxene, it is suggested that the pluton was the product of the fractional crystallization of mantle-derived primary magma.In addition, the pluton is relatively rich in LILEs such as Rb and Ba, and depletion in HFSEs such as Nb and Ta, with +5.4 to +9.0 of zircon εHf(t) values, which indicates that the pluton was derived from a depleted lithospheric mantle that experienced metasomatism from the subduction fluid.The Lanjiayingzi gabbrodiorite and coeval A-type granites in Linxi area constitute the bimodal magmatic assemblage, which suggests that they were formed in an extensional setting.Combined with regional geology, it is suggested that the formation of the Early Cretaceous magmatic rocks in southern Great Khingan Range has relation with the post-collision extensional setting resulting from closure of the Mongol-Okhotsk Ocean.
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Key words:
- Southern Great Khingan Range /
- gabbrodiorite /
- Early Cretaceous /
- geochemistry /
- petrogenesis
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表 1 兰家营子地区辉长闪长岩LA-ICP-MS锆石U-Th-Pb分析数据
Table 1. U-Th-Pb age of LA-ICP-MS zircon from the Lanjiayingzi gabbrodiorite
点号 含量/10-6 232Th/238U 同位素比值 年龄/Ma Pb 232Th 238U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ DX03-1-01 39.1 1043 1370 0.76 0.0492 0.0017 0.1536 0.0051 0.0226 0.0002 154 77.8 145 4.5 144 1.4 DX03-1-02 34.7 808 1264 0.64 0.0472 0.0017 0.1498 0.0055 0.0228 0.0002 61.2 81.5 142 4.8 145 1.6 DX03-1-03 40.4 1088 1414 0.77 0.0491 0.0016 0.1561 0.0050 0.0229 0.0002 150 80.5 147 4.4 146 1.4 DX03-1-04 41.2 1040 1471 0.71 0.0492 0.0016 0.1555 0.0052 0.0226 0.0002 167 77.8 147 4.6 144 1.4 DX03-1-05 72.6 2424 2393 1.01 0.0485 0.0014 0.1545 0.0042 0.0228 0.0002 124 66.7 146 3.7 145 1.2 DX03-1-06 53.6 1870 1729 1.08 0.0488 0.0016 0.1553 0.0050 0.0228 0.0002 139 77.8 147 4.4 145 1.4 DX03-1-07 38.5 920 1372 0.67 0.0477 0.0017 0.1536 0.0056 0.0230 0.0002 83.4 85.2 145 4.9 146 1.6 DX03-1-08 21.32 472 788 0.60 0.0456 0.0019 0.1460 0.0060 0.0230 0.0003 138 5.3 146 1.6 DX03-1-09 27.90 587 999 0.59 0.0495 0.0018 0.1592 0.0054 0.0232 0.0002 172 83.3 150 4.7 148 1.5 DX03-1-10 58.1 1710 1993 0.86 0.0471 0.0014 0.1502 0.0044 0.0228 0.0002 57.5 66.7 142 3.9 146 1.3 DX03-1-11 38.6 1139 1271 0.90 0.0480 0.0017 0.1559 0.0051 0.0233 0.0002 98.2 88.0 147 4.5 148 1.5 DX03-1-12 49.4 1292 1772 0.73 0.0493 0.0016 0.1542 0.0051 0.0224 0.0002 161 77.8 146 4.4 143 1.4 DX03-1-13 213 10678 5844 1.83 0.0494 0.0012 0.1583 0.0038 0.0229 0.0002 169 62.0 149 3.4 146 1.3 DX03-1-14 144.0 5856 4321 1.36 0.0491 0.0013 0.1568 0.0039 0.0229 0.0002 154 56.5 148 3.4 146 1.3 DX03-1-15 16.84 429 578 0.74 0.0491 0.0021 0.1567 0.0064 0.0230 0.0003 150 100 148 5.7 146 1.7 DX03-1-16 29.5 798 1026 0.78 0.0492 0.0020 0.1548 0.0062 0.0225 0.0002 167 99.1 146 5.5 144 1.5 DX03-1-17 18.31 551 638 0.86 0.0493 0.0023 0.1563 0.0075 0.0226 0.0003 165 139 147 6.6 144 1.6 DX03-1-18 30.5 889 1037 0.86 0.0496 0.0020 0.1566 0.0061 0.0228 0.0003 176 125.0 148 5.4 146 1.7 DX03-1-19 25.93 538 955 0.56 0.0485 0.0021 0.1562 0.0067 0.0231 0.0003 120 100 147 5.9 147 1.7 DX03-1-20 35.5 779 1276 0.61 0.0476 0.0017 0.1518 0.0055 0.0229 0.0002 79.7 85.2 143 4.9 146 1.6 DX03-1-21 40.3 1100 1395 0.79 0.0486 0.0016 0.1538 0.0049 0.0228 0.0002 132 77.8 145 4.3 145 1.5 DX03-1-22 23.04 486 826 0.59 0.0481 0.0019 0.1546 0.0061 0.0230 0.0002 102 92.6 146 5.4 147 1.6 DX03-1-23 59.2 2051 1903 1.08 0.0485 0.0016 0.1563 0.0048 0.0232 0.0003 124 71.3 147 4.2 148 1.7 DX03-1-24 62.4 2556 1915 1.34 0.0492 0.0014 0.1548 0.0044 0.0226 0.0002 167 73.1 146 3.9 144 1.4 
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表 2 兰家营子辉长闪长岩主量、微量和稀土元素含量
Table 2. Contents of major and trace elements, as well as REE of the Lanjiayingzi gabbrodiorite
样品号 DX03-1 DX03-2 DX03-3 DX03-4 DX03-5 样品号 DX03-1 DX03-2 DX03-3 DX03-4 DX03-5 SiO2 54.09 53.7 53.38 54.45 53.45 Cr 84.4 94.3 109 83.1 84.2 TiO2 0.99 1.05 1.23 1.15 1.16 Hf 2.82 2.88 2.94 2.71 2.81 Al2O3 18.49 18.18 17.95 18.61 18.23 Cs 3.09 3.23 2.8 2.19 2.22 TFe2O3 7.95 8.21 8.33 7.53 8.13 Sc 13.6 14.6 15.9 13.8 13.8 MnO 0.11 0.12 0.12 0.12 0.12 Ta 0.3 0.32 0.37 0.34 0.33 MgO 5.54 5.7 5.73 5.44 5.56 Co 29.4 31.4 31.5 27.2 31.3 CaO 7.63 7.66 7.81 7.59 7.73 U 0.86 0.96 0.83 1 0.89 Na2O 3.97 3.92 3.85 4.05 3.9 Sn 1.17 1.11 1.18 1.1 1.04 K2O 1.43 1.34 1.35 1.41 1.35 La 32.9 18.7 102 17 14.8 P2O5 0.22 0.24 0.23 0.26 0.29 Ce 54.7 37.1 140 36 33.6 烧失量 0.08 0.21 0.05 0.16 0.31 Pr 5.88 4.52 12.5 4.53 4.44 总计 100.58 100.39 100.1 100.83 100.29 Nd 22.5 18.9 41 19.2 19.2 A/CNK 0.84 0.83 0.82 0.85 0.83 Sm 4.08 3.89 5.36 4 4.08 Ba 461 452 467 455 444 Eu 1.51 1.48 1.72 1.53 1.47 Rb 27.8 27.7 26.9 28.5 25.9 Gd 3.54 3.43 4.06 3.66 3.68 Sr 818 828 842 839 820 Tb 0.49 0.51 0.55 0.52 0.55 Y 14.8 15.9 16.1 15.7 16.1 Dy 2.8 2.93 3.2 3.09 3.17 Zr 118 115 114 106 111 Ho 0.53 0.55 0.58 0.57 0.57 Nb 4.41 4.71 5.6 5.03 5.02 Er 1.39 1.47 1.45 1.45 1.46 Th 2.57 2.69 4.17 2.78 2.38 Tm 0.21 0.21 0.22 0.22 0.22 Pb 6.62 6.45 6.66 6.84 6.75 Yb 1.19 1.37 1.32 1.32 1.32 Ga 20.6 20.4 21 20.8 20.5 Lu 0.17 0.19 0.2 0.2 0.2 Zn 76.5 83.5 85.2 75.7 84 Mg# 37.39 37.31 37.09 38.24 36.96 Cu 11.8 9.51 10.7 9.93 13.9 δEu 1.21 1.24 1.13 1.22 1.16 Ni 30.2 32.1 32.6 25.2 31.2 (La/Yb)N 18.64 9.20 52.10 8.68 7.56 V 140 147 169 157 150 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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表 3 兰家营子辉长闪长岩锆石Lu-Hf同位素分析结果
Table 3. Zircon Lu-Hf isotopic data of the Lanjiayingzi gabbrodiorite
测点号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ εHf(0) εHf(t) 2σ TDM1/Ma fLu/Hf DX03-1-01 144 0.025142 0.000640 0.282888 0.000019 4.1 7.2 0.7 512 -0.98 DX03-1-02 145 0.021711 0.000557 0.282890 0.000016 4.2 7.3 0.6 508 -0.98 DX03-1-03 146 0.017745 0.000402 0.282911 0.000016 4.9 8.1 0.6 476 -0.99 DX03-1-04 144 0.036712 0.000868 0.282895 0.000019 4.3 7.4 0.7 505 -0.97 DX03-1-05 145 0.066984 0.001591 0.282905 0.000020 4.7 7.7 0.7 500 -0.95 DX03-1-07 146 0.022079 0.000523 0.282887 0.000017 4.1 7.2 0.6 512 -0.98 DX03-1-08 146 0.020129 0.000501 0.282886 0.000015 4.0 7.2 0.5 512 -0.98 DX03-1-09 148 0.021605 0.000490 0.282877 0.000017 3.7 6.9 0.6 525 -0.99 DX03-1-10 146 0.031634 0.000729 0.282886 0.000021 4.0 7.2 0.8 515 -0.98 DX03-1-11 148 0.053899 0.001231 0.282904 0.000019 4.7 7.8 0.7 497 -0.96 DX03-1-12 143 0.032645 0.000768 0.282902 0.000017 4.6 7.7 0.6 494 -0.98 DX03-1-13 146 0.027665 0.000595 0.282911 0.000019 4.9 8.1 0.7 479 -0.98 DX03-1-14 146 0.053093 0.001158 0.282896 0.000018 4.4 7.5 0.6 507 -0.97 DX03-1-15 146 0.033945 0.000623 0.282898 0.000024 4.5 7.6 0.9 497 -0.98 DX03-1-16 144 0.042239 0.000877 0.282923 0.000019 5.3 8.4 0.7 466 -0.97 DX03-1-17 144 0.031130 0.000635 0.282908 0.000026 4.8 7.9 0.9 483 -0.98 DX03-1-18 146 0.045799 0.000869 0.282938 0.000025 5.9 9.0 0.9 443 -0.97 DX03-1-19 147 0.015344 0.000297 0.282887 0.000021 4.1 7.3 0.7 509 -0.99 DX03-1-20 146 0.019434 0.000419 0.282877 0.000020 3.7 6.9 0.7 524 -0.99 DX03-1-22 147 0.040944 0.000848 0.282900 0.000021 4.5 7.7 0.8 497 -0.97 DX03-1-23 148 0.037534 0.000781 0.282914 0.000026 5.0 8.2 0.9 477 -0.98 DX03-1-24 144 0.056441 0.001153 0.282838 0.000029 2.3 5.4 1.0 590 -0.97
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